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Talk:Richardson's theorem

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Use of sqrt(x^2)

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The article states at the present moment that if sqrt(x^2) is in E, then the A(x) = 0 is unsolveable. But sqrt(x^2) = x. This seems to be a weird formulation. — Preceding unsigned comment added by 217.227.80.156 (talk) 16:43, 29 June 2011 (UTC)[reply]

sqrt(x^2) is unequal to x for x < 0. —Mark Dominus (talk) 19:56, 29 June 2011 (UTC)[reply]